Sisseton, SD: September

30 September 2026: September 2026 averaged 64.7°F in Sisseton, SD, the warmest September since 2024, tied 7th warmest of 93 (with 2021 and 1952).

September 2026

Mean temperature: 64.7°F; Warmest since 2024; 7th warmest of 93
Precipitation: 2.42 in; Wettest since 2025; 33rd wettest of 94

A normal September in Sisseton, SD (1991 to 2020): a mean temperature of 60.6°F, between 57.4°F and 64.5°F in eight years of ten and 2.18 in of precipitation, between 0.40 in and 5.09 in in eight years of ten.

The mean temperature of every September in Sisseton, SD since 1932: 64.7°F in 2026; the highest is 67.9°F, in 2024.

Normal range, 57.4 to 64.5°F

Every year, ranked, as a table

Every September in Sisseton, SD from 1932 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.

Year	Mean, °F	Rank	High, °F	Rank	Low, °F	Rank	Precipitation, in	Rank	Days missing
2026	64.7	7	75.6	31	53.7	4	2.42	33	0
2025	64.6	10	77.3	18	51.8	11	3.02	20	0
2024	67.9	1	82.1	1	53.8	3	0.09	92	0
2023	64.3	15	77.4	17	51.3	17	3.57	16	0
2022	64.2	16	79.1	5	49.2	36	0.08	93	0
2021	64.7	7	78.1	12	51.3	17	4.21	7	0
2020	59.3	66	71.9	63	46.7	66	1.05	59	0
2019	62.1	37	72.2	60	52	8	6.31	2	0
2018	59.7	59	71.5	67	47.8	54	1.88	44	0
2017	62.8	30	74.2	46	51.3	17	4.21	7	0
2016	62.2	36	73.5	52	51	21	2.20	37	0
2015	65.6	5	79	8	52.2	7	0.34	85	0
2014	60.6	49	72.4	58	48.9	40	0.84	65	0
2013	64.5	12	77.6	13	51.4	13	2.64	30	0
2012	59.4	64	76.3	24	42.4	93	0.17	88	0
2011	58.8	71	71.8	65	45.8	76	0.42	79	0
2010	57.2	85	68.1	86	46.3	70	5.63	3	0
2009	62.7	31	74.8	42	50.6	23	2.15	39	0
2008	60	58	73	55	46.9	61	3.71	13	0
2007	62.1	37	74.9	41	49.3	33	2.98	21	0
2006	57.4	82	67.9	88	46.9	61	5.03	4	0
2005	64.6	10	76.6	21	52.7	5	2.58	31	0
2004	63.2	25	75.2	36	51.2	20	6.65	1	0
2003	58.4	74	71.1	70	45.8	76	0.50	78	1
2002	63.3	23	76.1	25	50.4	25	1.09	58	0
2001	58.4	74	71.1	70	45.7	79	2.68	29	2
2000	59.7	59	74.3	45	45	84	0.88	62	0
1999	56.3	89	67.6	89	45.1	82	1.52	51	1
1998	64.4	14	79.9	4	48.9	40	0.02	94	0
1997	64.5	12	77.3	18	51.5	12	0.41	80	1
1996	58.8	71	70.6	75	46.9	61	3.94	10	2
1995			71	74	46	73	3.66	14	4
1994	62.5	35	73.5	52	51.4	13	2.29	35	0
1993	55.6	92	68	87	43.2	89	2.11	41	0
1992	59.5	63	72	62	47.4	59	2.13	40	1
1991	60.8	47	72.5	57	48.7	45	2.74	26	2
1990	63	27	75	39	50.9	22	2.69	28	0
1989	60.9	45	72.4	58	49.2	36	2.94	22	1
1988	60.3	52	71.7	66	48.8	42	3.88	11	0
1987	62.1	37	74.1	48	50.1	27	2.31	34	1
1986	57.3	84	65.3	92	49.3	33	4.96	5	0
1985	56.6	87	65.2	93	48	51	2.17	38	1
1984	55.7	90	67.4	90	44.9	86	1.21	56	2
1983	62.6	33	74.1	48	51.4	13	1.84	46	2
1982	60.3	52	72.2	60	48.3	48	2.51	32	0
1981	60.3	52	75.6	31	46	73	0.53	77	3
1980	61	44	74.7	43	47.5	58	0.37	82	1
1979	63.6	19	77.6	13	49.5	29	0.11	90	0
1978	67.1	2	79.1	5	55.1	1	1.11	57	1
1977	59.6	62	69.6	78	49.5	29	3.50	17	0
1976	63.4	22	79.1	5	47.7	55	0.85	64	0
1975	58	80	71.1	70	45	84	1.48	53	0
1974	58.8	71	74.6	44	42.5	92	0.37	82	1
1973	59.2	67	70.4	76	48	51	2.91	23	0
1972	60.1	55	75.1	37	45.1	82	0.10	91	0
1971	63	27	75.6	31	50.2	26	0.69	74	1
1970	63.6	19	77.5	16	49.7	28	1.78	47	0
1969	63.2	25	78.4	10	48	51	0.13	89	0
1968	61.5	41	73.8	51	49.1	38	4.03	9	0
1967	62.6	33	77	20	48.3	48	0.83	67	0
1966	60.8	47	75.4	35	46.2	71	0.79	69	0
1965	50.3	93	60	94	40.7	94	4.59	6	0
1964	57.5	81	69.6	78	45.4	81	1.78	47	0
1963	64	17	75.9	28	52	8	1.51	52	0
1962									7
1961	59.4	64	71.2	69	47.7	55	3.63	15	0
1960	63.3	23	76	26	50.6	23	0.79	69	0
1959	61.7	40	75	39	48.4	47	1.71	49	0
1958	63.6	19	77.6	13	49.4	31	0.73	73	1
1957	58.4	74	70.1	77	46.6	67	1.88	44	0
1956	58.4	74	73.3	54	43.5	88	0.87	63	0
1955	60.9	45	76	26	45.8	76	0.74	72	1
1954	59	70	69.1	81	48.8	42	3.05	19	0
1953	61.4	42	75.9	28	46.9	61	0.30	86	0
1952	64.7	7	81.2	3	48.2	50	0.40	81	1
1951	56.5	88	68.9	84	43.1	91	0.35	84	3
1950	60.1	55	74.1	48	46.1	72	0.81	68	0
1949	59.1	68	71.9	63	46.4	68	1.66	50	0
1948	66.8	4	79	8	54.8	2	1.95	43	2
1947	60.6	49	72.7	56	48.5	46	1.31	55	0
1946	58.4	74	69.1	81	47.6	57	3.43	18	0
1945	57	86	69	83	46.4	68	2.90	24	2
1944	59.1	68	68.9	84	49.3	33	2.08	42	0
1943	58.2	79	69.5	80	46.8	65	0.91	61	0
1942	55.7	90	66.1	91	44.9	86	2.25	36	1
1941	59.7	59	71.1	70	49.4	31	2.81	25	2
1940	64.8	6	78.2	11	51.4	13	0.64	75	0
1939	62.9	29	76.6	21	49.1	38	0.75	71	0
1938	63.9	18	75.6	31	52	8	3.80	12	1
1937	60.1	55	74.2	46	45.9	75	0.59	76	0
1936	62.7	31	76.5	23	48.8	42	1.46	54	0
1935	60.4	51	75.1	37	45.6	80	0.30	86	0
1934	57.4	82	71.5	67	43.2	89	2.70	27	0
1933	67	3	81.5	2	52.4	6	1.03	60	0
1932	61.4	42	75.7	30	47.1	60	0.84	65	0

Warmest, coldest, wettest and driest

Warmest
Year	Mean, °F
2024	67.9
1978	67.1
1933	67
1948	66.8
2015	65.6
1940	64.8
2026	64.7
2021	64.7
1952	64.7
2025	64.6
More years share the last value

Coldest
Year	Mean, °F
1965	50.3
1993	55.6
1984	55.7
1942	55.7
1999	56.3
1951	56.5
1985	56.6
1945	57
2010	57.2
1986	57.3

Wettest
Year	Precipitation, in
2004	6.65
2019	6.31
2010	5.63
2006	5.03
1986	4.96
1965	4.59
2021	4.21
2017	4.21
1968	4.03
1996	3.94

Driest
Year	Precipitation, in
1998	0.02
2022	0.08
2024	0.09
1972	0.10
1979	0.11
1969	0.13
2012	0.17
1953	0.30
1935	0.30
2015	0.34

The hottest, coldest and wettest days

Hottest day: 93°F; 3 September 2026
Coldest night: 42°F; 16 September 2026
Wettest day: 0.98 in; 18 September 2026

Every month, season and year

Months

Seasons

Years

Sisseton, SD the day's answers

All-time records

Every answer in words

September 2026 brought 2.42 in of precipitation in Sisseton, SD, the wettest September since 2025, 33rd wettest of 94.
The hottest day of September 2026 in Sisseton, SD: 93°F on Thursday 3 September 2026.
The coldest night of September 2026 in Sisseton, SD: a low of 42°F on Wednesday 16 September 2026.
The wettest day of September 2026 in Sisseton, SD: 0.98 in on Friday 18 September 2026.